function block_ul() {
    var report_ico = document.getElementById("ReportIco");
    if (report_ico.className === "iconfont icon-jiantou-shang"){
        report_ico.className = "iconfont icon-jiantou-xia";
        document.getElementById("SystemReport").style.display="block";
    }else {
        report_ico.className = "iconfont icon-jiantou-shang";
        document.getElementById("SystemReport").style.display="none";
    }
}



